CN111085571B - Method for eliminating transverse roll marks after strip steel is leveled - Google Patents
Method for eliminating transverse roll marks after strip steel is leveled Download PDFInfo
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- CN111085571B CN111085571B CN201911272440.1A CN201911272440A CN111085571B CN 111085571 B CN111085571 B CN 111085571B CN 201911272440 A CN201911272440 A CN 201911272440A CN 111085571 B CN111085571 B CN 111085571B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
Abstract
The invention discloses a method for eliminating transverse roll marks after strip steel is leveled, which belongs to the technical field of steel rolling, and controls the sheet building process of a leveling machine according to a first preset condition; controlling the outlet side tension of the temper mill to be larger than the inlet side tension through the first tension roller set and the second tension roller set; when the closed rack is changed from 7.5mm to 0mm, the proportional parameters of the PID controller are adjusted according to a preset strategy; opening an anti-vibration roller at an inlet of the temper mill and a crease-resistant roller at an outlet of the temper mill, and enabling the anti-vibration roller and the crease-resistant roller to run to preset positions; a strip steel guide baffle is arranged on the inlet side of the rack to control the head of the strip steel to penetrate; first tension roll group keeps away from one side-mounting roller set of rectifying of frame, through rectify the roller set to after belted steel rectifies, to the levelling machine operation to after leveling the outlet side operation of levelling machine has reached the technological effect of eliminating horizontal roll mark defect.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to a method for eliminating a transverse roll mark after strip steel is leveled.
Background
The steel strip after recrystallization annealing and galvanization is required to be flat, so that the steel strip obtains necessary performance and surface quality, and the requirement of post-procedure processing is met. The leveling machine on a continuous hot galvanizing unit is essentially rolling deformation with small reduction. The flattening of strip steel is a process in the finishing production of strip steel, which determines the final quality of the steel sheet. The flattening is the final procedure for improving the surface quality and the metal performance of the strip steel, and the strip steel is cut into finished steel plates (or steel coils) after being flattened, and the finished steel plates (or steel coils) are sorted and packaged and are sent to users.
In the production and operation process of the continuous annealing line, when a wide plate is produced, transverse roll marks are easy to appear in the process of closing the frame after the roll of the temper mill is changed, and the qualification rate of the automobile plate is seriously influenced.
Disclosure of Invention
The invention provides a method for eliminating transverse roll marks after strip steel is leveled, which is used for solving the technical problems that the transverse roll marks are easy to appear in the process of closing a rack after a leveler changes rolls during wide plate production in the prior art and the product percent of pass is seriously influenced, thereby achieving the technical effects of eliminating the defects of the transverse roll marks, improving the product percent of pass and providing powerful guarantee for production line production.
The invention provides a method for eliminating transverse roll marks after strip steel is leveled, equipment used in the method comprises a leveling machine, the leveling machine comprises a first tension roller set, a rack and a second tension roller set, the leveling machine is controlled by a PID controller, and the method comprises the following steps: step 1: controlling the sheet building process of the temper mill according to a first preset condition; step 2: controlling the outlet side tension of the temper mill to be larger than the inlet side tension through the first tension roller set and the second tension roller set; and step 3: when the closed rack is changed from 7.5mm to 0mm, the proportional parameters of the PID controller are adjusted according to a preset strategy; and 4, step 4: opening an anti-vibration roller at an inlet of the temper mill and a crease-resistant roller at an outlet of the temper mill, and enabling the anti-vibration roller and the crease-resistant roller to run to preset positions; and 5: a strip steel guide baffle is arranged on the inlet side of the rack to control the head of the strip steel to penetrate; step 6: the first tension roller group is far away from one side installation of frame roller set of rectifying, through rectify the roller set to after belted steel rectifies, to the levelling machine operation, and after leveling the outlet side operation of levelling machine.
Preferably, in the step 1, the first preset condition is specifically: and when the roll gap of the temper mill is reduced to 0mm, starting to build the sheet.
Preferably, in the step 2, the outlet-side tension is controlled to be 4% to 6%.
Preferably, the first tension roller group and the second tension roller group respectively comprise a pneumatic adjustable compression roller, and the compression roller is used for pressing the strip steel when the machine is stopped and/or the strip is broken and/or maintained.
Preferably, in the step 3, the preset policy specifically includes: in the elongation percentage control process, a first output value of the PID controller is an upper limit value of the PID controller; and controlling a second output value of the PID controller to be smaller than the first output value in the process of closing the rack.
Preferably, in the step 4, the wrinkle-preventing roller is clamped by a hydraulic cylinder clamping device, and the current position of the wrinkle-preventing roller is detected by a position sensor when the strip steel is threaded.
Preferably, in the step 5, the strip guide fence is driven by a hydraulic cylinder, and a purge nozzle is provided at one end of the strip guide fence and is purged toward the work roll.
Preferably, in the step 5, a blow-off nozzle is arranged on the strip steel guide baffle plate and is used for blowing off and blowing off the emulsion on the strip steel.
Preferably, in the step 6, the deviation rectifying range of the deviation rectifying roller group is ± 150 mm.
Preferably, in the step 6, the deviation correcting roller group is controlled by a deviation correcting system, wherein the deviation correcting system comprises a deviation correcting frame, and the actual position of the strip steel is detected by the deviation correcting frame.
One or more technical solutions in the embodiments of the present invention at least have one or more of the following technical effects:
the embodiment of the invention provides a method for eliminating transverse roll marks after strip steel is leveled, wherein equipment used in the method comprises a leveling machine, the leveling machine comprises a first tension roller set, a rack and a second tension roller set, the leveling machine is controlled by a PID controller, and the method comprises the following steps: step 1: controlling the sheet building process of the temper mill according to a first preset condition; step 2: controlling the outlet side tension of the temper mill to be larger than the inlet side tension through the first tension roller set and the second tension roller set; and step 3: when the closed rack is changed from 7.5mm to 0mm, the proportional parameters of the PID controller are adjusted according to a preset strategy; and 4, step 4: opening an anti-vibration roller at an inlet of the temper mill and a crease-resistant roller at an outlet of the temper mill, and enabling the anti-vibration roller and the crease-resistant roller to run to preset positions; and 5: a strip steel guide baffle is arranged on the inlet side of the rack to control the head of the strip steel to penetrate; step 6: first tension roller group keeps away from a side-mounting roller set of rectifying of frame, through rectify the roller set to after belted steel rectifies, to the levelling machine operation, and after leveling the back to the outlet side operation of levelling machine to solve among the prior art when the levelling machine roll change after the in-process of closed frame appear horizontal roll mark easily, seriously influence the technical problem of product percent of pass, reached and eliminated horizontal roll mark defect, improve the product percent of pass, provide the technological effect of powerful guarantee for producing the line production.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
FIG. 1 is a schematic flow chart of a method for eliminating transverse roll marks after strip steel is leveled according to an embodiment of the invention;
FIG. 2 is a schematic view of a leveler device according to an embodiment of the present invention;
FIG. 3 is a schematic view of the interior of the leveler in the embodiment of the present invention;
FIG. 4 is a diagram illustrating a position control of the leveler in an embodiment of the present invention;
FIG. 5 is a diagram of the roll gap position of the leveler in an embodiment of the present invention;
FIG. 6 is a scale factor control map of a PID controller in an embodiment of the invention.
Description of reference numerals: the first tension roller group 1, the levelling machine frame 2, the dryer 3, the second tension roller group 4, the last supporting roller 5 of levelling machine, the last gun roller 6 of levelling machine, the last working roller 7 of levelling machine, the entry of levelling machine prevent quivering roller 11, the lower working roller 8 of levelling machine, the lower gun roller 9 of levelling machine, the lower supporting roller 10 of levelling machine, the export crease-resistant roller 12 of levelling machine, roll gap 13.
Detailed Description
The embodiment of the invention provides a method for eliminating transverse roll marks after strip steel is leveled, which is used for solving the technical problems that the transverse roll marks are easy to appear in the process of closing a rack after a leveler changes rolls during wide plate production in the prior art, and the product percent of pass is seriously influenced.
The technical scheme in the embodiment of the invention has the following general idea:
the embodiment of the invention provides a method for eliminating transverse roll marks after strip steel is leveled, which comprises the following steps of 1: controlling the sheet building process of the temper mill according to a first preset condition; step 2: controlling the outlet side tension of the temper mill to be larger than the inlet side tension through the first tension roller set and the second tension roller set; and step 3: when the closed rack is changed from 7.5mm to 0mm, the proportional parameters of the PID controller are adjusted according to a preset strategy; and 4, step 4: opening an anti-vibration roller at an inlet of the temper mill and a crease-resistant roller at an outlet of the temper mill, and enabling the anti-vibration roller and the crease-resistant roller to run to preset positions; and 5: a strip steel guide baffle is arranged on the inlet side of the rack to control the head of the strip steel to penetrate; step 6: first tension roller group keeps away from a side-mounting roller set of rectifying of frame, through rectify the roller set to after belted steel rectifies, to the levelling machine operation to after leveling the outlet side operation of levelling machine has reached and has eliminated horizontal roll mark defect, improves the product percent of pass, provides the technological effect of powerful guarantee for producing the line production.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Fig. 1 is a schematic flow chart of a method for eliminating transverse roll marks after strip steel is flattened, in an embodiment of the invention, the method uses equipment including a flattening machine, the flattening machine comprises a first tension roll group, a frame and a second tension roll group, and the flattening machine is controlled by a PID controller, as shown in fig. 1, the method includes:
step 1: and controlling the sheet building process of the temper mill according to a first preset condition.
Further, in the step 1, the first preset condition is specifically that: and when the roll gap of the temper mill is reduced to 0mm, starting to build the sheet.
Specifically, at present, the roll mark defect of the strip steel mainly occurs in the process of closing the stand after the roll change of the temper mill, and the roll mark defect obtained through analyzing the data of the closed stand mainly occurs in the process of closing the stand, namely the roll gap is from 7.5mm to 0mm, and the rolling force is from 0KN to 750KN, so that the optimization and improvement of the process are needed. As shown in fig. 2, the leveler equipment mainly includes: as shown in fig. 3 and 5, the first tension roller group 1, the leveler frame 2, the dryer 3, and the second tension roller group 4 are provided inside the leveler: the upper supporting roll 5 of the temper mill, the upper gun roll 6 of the temper mill, the upper working roll 7 of the temper mill, the anti-shake roll 11 at the inlet of the temper mill, the lower working roll 8 of the temper mill, the lower gun roll 9 of the temper mill, the lower supporting roll 10 of the temper mill and the crease-resistant roll 12 at the outlet of the temper mill. Firstly, tension when the tension is built on the temper mill needs to be controlled, specifically: the tension is directly established once by adjusting the temper mill, namely directly establishing the tension when the roll gap is reduced to 0 mm. In other words, in this embodiment, the process of establishing tension is adjusted from the original two-time tension establishment to the one-time tension establishment. When the outlet of the temper mill is opened, the strip steel is tensioned forwards by the tension roller at the outlet of the temper mill, namely the second tension roller group 4, and the frame is closed. When the stand is closed to the zero position, the working roll of the temper mill starts to roll a force control value, the strip steel is pressed tightly, the working roll pulls the strip steel forwards, and the inlet of the temper mill is tensioned.
Step 2: the tension of the outlet side of the temper mill is controlled to be larger than the tension of the inlet side of the temper mill through the first tension roller group 1 and the second tension roller group 4.
Further, the outlet side tension is controlled to be 4-6%.
Further, the first tension roller group 1 and the second tension roller group 4 both comprise a pneumatic position-adjustable press roller, and the press roller is used for pressing the strip steel during shutdown, and/or strip breakage, and/or maintenance.
Specifically, after the tension of the leveler is adjusted, the tension of the leveler can be stably controlled. To stabilize the operation of the leveler, the tension at the inlet and outlet of the leveler needs to be stabilized. Therefore, set up first tension roller set 1, the exit sets up second tension roller set 4 and measures actual tension size at the levelling machine entrance, first tension roller set 1 this moment be the levelling machine entrance tension roller set promptly, second tension roller set 4 is the levelling machine exit tension roller set promptly, first tension roller set 1, second tension roller set 4 this moment can regard as the tension measuring roller to this controls as feedback signal. The first tension roller group on the inlet side of the planishing mill is used as a speed reference roller, and the roller is a speed reference roller of a planishing area, is constant and does not participate in tension control. The tension of the leveler is thus the first set of tension rolls on the inlet side thereof and does not participate in tension control, the inlet side tension being generated by the forward tensioning of the work rolls. The outlet tension is generated by the tensioning of the second tension roller group, and the outlet tension is controlled to be slightly larger than the inlet tension so that the outlet tension is stably controlled and the outlet tension is controlled to be 5 +/-1%.
Further, in the present embodiment, it is preferable that the first tension roller group 1 of the leveler is designed to be a four-roller type, and is located in front of the leveler. Of these, three rollers ( rollers 1, 3, 4) are driven by variable speed motors and are equipped with pneumatic internal contracting brakes. Which operates to keep the reference speed of the leveler area constant. At the same time, the first tension roll group 1 is equipped with a pneumatically adjustable press roll, wherein the press roll is used for pressing the strip at shutdown (e.g. without tension) and at strip breakage or maintenance.
Further, in the present embodiment, the second tension roller set 4 of the leveler is preferably designed as a four-roller type, and is located in front of the leveler. The three rollers ( rollers 1, 3, 4) are driven by variable speed motors and the driven rollers are equipped with pneumatic band brakes. And keeping the tension of the strip steel at the inlet side of the finishing machine (relative to the back-up roll of the finishing machine) while keeping the tension after operation. The second set of tension rollers 4 is likewise provided with pneumatically positionable rollers. The press rolls are used to press the strip during shutdown (e.g., no tension in the strip) and during strip breaks or maintenance. That is, the strip speed was 0m/min roll reduction. Following the increase of the linear speed after the shutdown, the compression roller is automatically opened (adjustable, and the exact value can be set by debugging) at the latest when the linear speed is more than 120 m/min.
And step 3: and when the closed frame 2 is changed from 7.5mm to 0mm, adjusting the proportional parameters of the PID controller according to a preset strategy.
Further, in the step 3, the preset policy specifically includes: in the elongation percentage control process, a first output value of the PID controller is an upper limit value of the PID controller; and controlling a second output value of the PID controller to be smaller than the first output value in the process of closing the rack.
Specifically, a PID controller is a main element for control in the method, and the PID controller (proportional-integral-derivative controller) is composed of a proportional unit P, an integral unit I, and a derivative unit D. The Kp, Ki and Kd are set by three parameters. PID controllers are primarily suitable for systems where the basic linearity and dynamics do not change over time. In the present embodiment, it is preferable that the PID controller adopts a variable scaling factor, that is, when the rolling force is changed from 0KN to 750KN at the moment when the roll gap 13 is zero, the PID controller sets the scaling factor for the rolling force to a variable scaling factor, and reduces the scaling factor when closing the stand 2 from the previous one, and the scaling factor after closing the stand 2 is not changed. As shown in fig. 6, specifically: the rolling force control is adopted in the process of closing the stand 2 by 7.5 mm-0 mm, the rolling force is set to be 750KN before the roll gap 13 is zero, the actual rolling force is 0KN, the output of the rolling force PID controller is the upper limit value of the controller, in order to reduce the closing speed of the stand 2 and reduce the inertia of the stand when the stand is in contact, and simultaneously, the output response of the stand when the stand is in normal elongation control is not influenced, the output amplitude limit of the rolling force PID controller is optimized, in the normal elongation control, the output value of the PID controller is set to be the upper limit value of the PID controller and is set to be a smaller value when the stand is closed, and therefore the movement inertia of the stand 2 is reduced. Therefore, through the PID controller with the variable proportional coefficient, the smoothness and the stability of the actual rolling force change are improved, and the influence of the overshoot and the increase of the working roll on the strip steel caused by the overlarge rolling force change rate is reduced.
And 4, step 4: and opening the anti-vibration rollers 11 at the inlet of the temper mill and the crease-resistant rollers 12 at the outlet of the temper mill to enable the anti-vibration rollers 11 and the crease-resistant rollers 12 to run to preset positions.
Further, in the step 4, the wrinkle-preventing roller 12 is clamped by a hydraulic cylinder clamp device, and when the strip steel is threaded, the current position of the wrinkle-preventing roller 12 is detected by a position sensor.
Specifically, as shown in fig. 3, the anti-shake roller 11 and the wrinkle roller 12 are activated to run to the set position, wherein, in optimally controlling the wrinkle roller 12, the main method is: a blank holder 12 in front of the frame is used to lift the strip to the leveler operating line height and is clamped by a hydraulic cylinder clamp assembly in order to prevent the formation of folds and diagonal waves. When the belt is threaded, the roller moves to an optimal threading position through the detection of the position sensor. When the inlet tension has been established and the strip speed is 0, the rollers are lifted and contact the lower surface of the strip, and various parameters of the wrinkle preventing roller 12 can be adjusted according to actual needs, such as: the thickness is less than 0.5mm, and the insertion amount is 55 percent; 0.5-1.0, the insertion amount is 45%; 1.0-1.5, insertion amount 35%; 1.5-2.0, the insertion amount is 30%, is more than 2.0, and the insertion amount is 25%. If the actual value is below 25% of the immersion depth, the crease roller 12 will automatically be lowered to the bottom position during rolling. When the roller is replaced, this roller will be lowered completely.
And 5: and a strip steel guide baffle is arranged on the inlet side of the rack to control the head of the strip steel to penetrate.
Further, in the step 5, the strip steel guide baffle is driven by a hydraulic cylinder, and a purging nozzle is arranged at one end of the strip steel guide baffle and is used for purging towards the working roll.
Further, in the step 5, a blowing nozzle is arranged on the strip steel guide baffle plate and used for blowing and scattering the emulsion on the strip steel.
Specifically, the function of purging the strip steel is added, and the method mainly comprises the following steps: the strip steel guide baffle is arranged on the inlet side of the frame and is mainly used for guiding the head of the strip steel to penetrate through and preventing the strip steel from winding on a working roller when being torn. The strip steel guide baffle is driven by a hydraulic cylinder. The strip steel guide baffle plate moves a small distance towards the working roll direction during rolling. This distance from the work roll can be adjusted by software and with reference to the roll diameter. Before the rolls are replaced, the strip guide dams must be moved backwards so that there is sufficient space for the work rolls to be removed and moved in.
Furthermore, a slit-shaped nozzle is arranged at the front end part of the strip steel guide baffle and blows towards the working roll, so that the aim of preventing emulsion on the top from flowing onto the strip steel from the upper part of the working roll is fulfilled. Meanwhile, a blow-off nozzle for blowing off is also arranged on the strip steel guide baffle. The blowing nozzle is mainly used for blowing and blowing the emulsion on the strip steel. The proportional valve is only activated after the "purge on" switch has been activated. A pressure monitor is installed in the intake conduit.
Step 6: first tension roller set 1 keeps away from a side-mounting of frame 2 roller set of rectifying, through the roller set of rectifying is to after belted steel rectifies, to the levelling machine operation, and after leveling the outlet side operation of levelling machine.
Furthermore, the deviation rectifying range of the deviation rectifying roller group is +/-150 mm.
Further, in the step 6, the deviation correcting roller set is controlled by a deviation correcting system, wherein the deviation correcting system comprises a deviation correcting frame, and the actual position of the strip steel is detected by the deviation correcting frame.
Specifically, a deviation correcting roller set is installed at the front end of the first tension roller set, that is, at the side of the first tension roller set away from the frame, and the main function of the deviation correcting roller set is to adjust the center of the strip steel centering unit. Therefore, when the unit starts to operate, the strip steel operates to the temper mill after the deviation correction of the deviation correcting roller set and operates to the outlet after the strip steel is leveled. Further, the deviation rectifying range of the deviation rectifying roller group is +/-150 mm, wherein the parameters of the deviation rectifying roller can be installed and selected according to actual needs, such as phi 1250 × 2300 mm and the like. The position control deviation rectifying roller group is controlled by a deviation rectifying system, and the deviation rectifying system is used for centering the strip steel before the inlet. The deviation correcting system consists of a deviation correcting frame, and the deviation correcting frame comprises a detection device for sensing the position of the strip steel. And the deviation correcting frame is controlled to rotate by a hydraulic cylinder and controlled by a servo valve. The deviation position of the strip steel is reduced along with the movement of the deviation rectifying frame controlled by the servo cylinder control system. And controlling the position of the deviation rectifying roller by the field controller according to the position of the deviation rectifying frame detected by the position sensor and the actual position of the strip steel detected by the measuring frame. The unit ensures that the strip steel is straight in the running direction when passing through the temper mill. As shown in fig. 4, the leveler may be controlled accordingly, including: proportional control, integral control, oil leakage compensation, tilt control, etc.
One or more technical solutions in the embodiments of the present invention at least have one or more of the following technical effects:
the embodiment of the invention provides a method for eliminating transverse roll marks after strip steel is leveled, wherein equipment used in the method comprises a leveling machine, the leveling machine comprises a first tension roller set, a rack and a second tension roller set, the leveling machine is controlled by a PID controller, and the method comprises the following steps: step 1: controlling the sheet building process of the temper mill according to a first preset condition; step 2: controlling the outlet side tension of the temper mill to be larger than the inlet side tension through the first tension roller set and the second tension roller set; and step 3: when the closed rack is changed from 7.5mm to 0mm, the proportional parameters of the PID controller are adjusted according to a preset strategy; and 4, step 4: opening an anti-vibration roller at an inlet of the temper mill and a crease-resistant roller at an outlet of the temper mill, and enabling the anti-vibration roller and the crease-resistant roller to run to preset positions; and 5: a strip steel guide baffle is arranged on the inlet side of the rack to control the head of the strip steel to penetrate; step 6: first tension roller group keeps away from a side-mounting roller set of rectifying of frame, through rectify the roller set to after belted steel rectifies, to the levelling machine operation, and after leveling the back to the outlet side operation of levelling machine to solve among the prior art when the levelling machine roll change after the in-process of closed frame appear horizontal roll mark easily, seriously influence the technical problem of product percent of pass, reached and eliminated horizontal roll mark defect, improve the product percent of pass, provide the technological effect of powerful guarantee for producing the line production.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (9)
1. A method for eliminating transverse roll marks after strip steel is leveled is characterized in that equipment used in the method comprises a leveling machine, the leveling machine comprises a first tension roller set, a frame and a second tension roller set, the leveling machine is controlled by a PID controller, the first tension roller set is a leveling machine inlet tension roller set, the second tension roller set is a leveling machine outlet tension roller set, and the method comprises the following steps:
step 1: controlling the sheet building process of the temper mill according to a first preset condition, which specifically comprises the following steps: when the outlet side of the temper mill is opened, the second tension roller set tensions the strip steel forwards to close the frame; when the stand is closed to a zero position, the working roll of the temper mill starts to roll a force control value to press the strip steel, the working roll pulls the strip steel forwards, and the inlet of the temper mill is tensioned;
step 2: controlling the outlet side tension of the temper mill to be larger than the inlet side tension through the first tension roller set and the second tension roller set;
and step 3: when the closed rack is changed from 7.5mm to 0mm, the proportional parameters of the PID controller are adjusted according to a preset strategy;
and 4, step 4: opening an anti-vibration roller at an inlet of the temper mill and a crease-resistant roller at an outlet of the temper mill, and enabling the anti-vibration roller and the crease-resistant roller to run to preset positions;
and 5: a strip steel guide baffle is arranged on the inlet side of the rack to control the head of the strip steel to penetrate;
step 6: the first tension roller group is far away from one side installation of frame roller set of rectifying, through rectify the roller set to after belted steel rectifies, to the levelling machine operation, and after leveling the outlet side operation of levelling machine.
2. The method according to claim 1, wherein in step 1, the first preset condition is specifically: and when the roll gap of the temper mill is reduced to 0mm, starting to build the sheet.
3. The method of claim 1, wherein the first tension roll set and the second tension roll set each comprise a pneumatically adjustable press roll for pressing against the strip during a shutdown and/or during a strip break and/or during maintenance.
4. The method according to claim 1, wherein in the step 3, the preset policy is specifically:
in the elongation percentage control process, a first output value of the PID controller is an upper limit value of the PID controller;
and controlling a second output value of the PID controller to be smaller than the first output value in the process of closing the rack.
5. The method according to claim 1, wherein in the step 4, the wrinkle preventing roller is gripped by a hydraulic cylinder gripper device, and a current position of the wrinkle preventing roller is detected by a position sensor while the strip is being threaded.
6. The method according to claim 1, wherein in the step 5, the strip guide fence is driven by a hydraulic cylinder, and a purge nozzle is provided at one end of the strip guide fence, and the purge nozzle performs purge toward the work roll.
7. The method of claim 5, wherein in step 5, a blow-off nozzle is provided on the strip guide fence to blow off and blow off the emulsion on the strip.
8. The method of claim 1, wherein in step 6, the deflection correcting range of the deflection correcting roller set is ± 150 mm.
9. The method of claim 1, wherein in step 6, the set of deflection correcting rollers is controlled by a deflection correcting system, wherein the deflection correcting system includes a deflection correcting frame through which an actual position of the strip is detected.
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| CN201911272440.1A CN111085571B (en) | 2019-12-12 | 2019-12-12 | Method for eliminating transverse roll marks after strip steel is leveled |
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| CN201911272440.1A CN111085571B (en) | 2019-12-12 | 2019-12-12 | Method for eliminating transverse roll marks after strip steel is leveled |
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| CN113798981B (en) * | 2021-08-30 | 2023-04-28 | 马钢(合肥)钢铁有限责任公司 | Method for rapidly eliminating furnace roller surface nodulation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0639413A (en) * | 1992-07-24 | 1994-02-15 | Ube Ind Ltd | Method for preventing roll mark in rolling mill |
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| CN202779171U (en) * | 2012-07-31 | 2013-03-13 | 中冶南方工程技术有限公司 | Novel tempering lubricant purging device |
| CN105642677A (en) * | 2016-03-25 | 2016-06-08 | 首钢总公司 | Method and device for removing roll marks on surface of band steel |
| CN105983579A (en) * | 2015-02-13 | 2016-10-05 | 鞍钢股份有限公司 | Method for controlling residual defects of leveling fluid |
| CN110038907A (en) * | 2019-04-19 | 2019-07-23 | 首钢京唐钢铁联合有限责任公司 | A kind of method controlling planisher and the electrohydraulic servo system for controlling planisher |
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| JPH0639413A (en) * | 1992-07-24 | 1994-02-15 | Ube Ind Ltd | Method for preventing roll mark in rolling mill |
| CN102284519A (en) * | 2011-08-18 | 2011-12-21 | 中冶南方工程技术有限公司 | Water mist leveling system in cold-rolling wet leveling production |
| CN202779171U (en) * | 2012-07-31 | 2013-03-13 | 中冶南方工程技术有限公司 | Novel tempering lubricant purging device |
| CN105983579A (en) * | 2015-02-13 | 2016-10-05 | 鞍钢股份有限公司 | Method for controlling residual defects of leveling fluid |
| CN105642677A (en) * | 2016-03-25 | 2016-06-08 | 首钢总公司 | Method and device for removing roll marks on surface of band steel |
| CN110038907A (en) * | 2019-04-19 | 2019-07-23 | 首钢京唐钢铁联合有限责任公司 | A kind of method controlling planisher and the electrohydraulic servo system for controlling planisher |
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